If it's not your turn, you may exile a blue card from your hand rather than pay this spell's mana cost.
Counter target noncreature spell. If that spell is countered this way, exile it instead of putting it into it's owner's graveyard.

[+1]: Return up to one target land card from your graveyard to your hand.
[-1]: Wrenn and Six deals 1 damage to any target.
[-7]: You get an emblem with "Instant and sorcery cards in your graveyard have retrace."
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Flash
When Snapcaster Mage enters the battlefield, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)

[+2]: Look at the top card of target player's library. You may put that card on the bottom of that player's library.
[0]: Draw three cards, then put two cards from your hand on top of your library in any order.
[-1]: Return target creature to its owner's hand.
[-12]: Exile all cards from target player's library, then that player shuffles his or hand into his or her library.
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[+1]: Draw a card. At the beginning of the next end step, untap two lands.
[-3]: Put target nonland permanent into its owner's library third from the top.
[-8]: You get an emblem with "Whenever you draw a card, exile target permanent an opponent controls."
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Equipped creature gets +2/+2 and has protection from red and from blue.
Whenever equipped creature deals combat damage to a player, Sword of Fire and Ice deals 2 damage to any target and you draw a card.
Equip

When Urza, Lord High Artificer enters the battlefield, create a 0/0 colorless Construct artifact creature token with "This creature gets +1/+1 for each artifact you control."
Tap an untapped artifact you control: Add .: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.

[+1]: Each player discards a card.
[-2]: Target player sacrifices a creature.
[-6]: Separate all permanents target player controls into two separate piles. That player sacrifices all permanents in the pile of his or her choice.
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Protection from Humans
Pay 1 life, Sacrifice another creature: Put a -1/-1 counter on up to one target creature and draw a card., Discard a card: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

[+1]: Up to one target creature -2/-1 until your next turn.
[-2]: Put the top two cards of your library into your graveyard, then you may return a creature card from your graveyard to your hand.
[-7]: You get an emblem with "At the beginning of your end step, put X 2/2 black Zombie creature tokens onto the battlefield, where X is two plus the number of Zombies you control."

When Stoneforge Mystic enters the battlefield, you may search your library for an Equipment card, reveal it, put it into your hand, then shuffle your library., : You may put an Equipment card from your hand onto the battlefield.

Activated abilities of artifacts your opponents control can't be activated.
[+1]: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its converted mana cost.
[-2]: You may choose an artifact card you own from outside the game or in exile, reveal that card, and put it into your hand.
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